1.Qhov muag nta
Hastelloy c {0}}} alloy alloy (unshoy allouge (Nickel-Molybdenum cov kev txhawj xeeb ntau tshaj thiab kev tsim txiaj ntawm cov khoom lag luam qis heev thiab silicon txheem). Xws li, nws tau pom nyob hauv cov txheej txheem tshuaj lom neeg thiab tam sim no muaj ntau dua {}}
Zoo li lwm tus nickel alloys, nws yog cooths, yooj yim rau daim ntawv, thiab muaj kev zam txim rau kev ua tsis ncaj rau cov neeg ua haujlwm tsis zoo). Nrog nws cov roj chromium siab thiab molybdenum ntsiab, nws muaj peev xwm tiv thaiv ob qho tib si oxidizing thiab cov khoom pov thawj zoo nyob rau hauv muaj cov kab chlorides thiab lwm yam. Tsis tas li ntawd, nws yog tus tiv taus sulfide kev ntxhov siab tawg thiab kev nyuaj siab corrosion tawg hauv qaub, oilfield ib puag ncig.
Hastelloy c {0}}} Alloy allloys muaj nyob rau hauv daim phaj, cov ntawv, cov xaim, xaim, cov raj, thiab npog cov hluav taws xob. Cov tshuaj raug tshuaj lom neeg kev lag luam (CPI) suav nrog cov reactors, kev hloov pauv kub, thiab kab kom sov.
2. suav rau pitting thiab crevice corrosion
Lawg®C -276 Cov khoom pov thawj kub tsis kam mus rau chloride nres thiab crevice nres tsheb uas cov tshuaj tiv thaiv tsis zoo tshaj plaws yog nquag. Txhawm rau ntsuas qhov tsis kam ntawm alloys rau pitting thiab kev sib tw los sawv cev ntawm cov qauv uas muaj teeb meem ntawm cov lus qhia no, tsis pub dhau 72 teev. Rau kev sib piv, qhov tseem ceeb rau 316L, 254smo, 625, thiab c -276 alloys muaj raws li hauv qab no:
| Hlau |
Qhov tseem ceeb pitting txias hauv acidified 6% fecl3
|
Qhov tseem ceeb crevice kub nyob rau hauv acidified 6% fecl3
|
||
| Degree F | tiv kis | Degree F | tiv kis | |
| 316L | 59 | 15 | 32 | 0 |
| 254Smo | 140 | 60 | 86 | 30 |
| 625 | 212 | 100 | 104 | 40 |
| C-276 | 302 | 150 | 131 | 55 |
Lwm qhov chaw chloride ib puag ncig, ib puag ncig ib puag ncig, tsis muaj kev tuag ntsuab (11.5% h2Yog li4{{0 {0}}. 2% hcl + 1}}% fecl3+ 1}% CUCL2) thiab Daj Tuag (4% nacl + 0. 1% FE2(Yog li ntawd4)3{{0 {0}} Hauv kev tuag ntsuab, qhov qis tshaj plaws ntawm qhov uas pitting tau raug pom nyob rau hauv c -276 alloy yog qhov npau npau. Hauv kev tuag daj, c {{4 4}}}}} ecloy ecloys tseem ceeb tshaj plaws ntsuas kub (150 6}}} alloy hauv daj tuag yog 60 degree.
3. suav rau kev ntxhov siab corrosion tawg
Ib tug ntawm tus thawj coj ntawm Nickel alloys yog lawv txoj kev tiv thaiv tsis kam lees chloride-induced kev nyuaj siab corrosion. Ib qho kev daws teeb meem rau kev ntsuas cov ntaub ntawv tiv thaiv kab mob no yog rhaub 55% chloride ua rau muaj kev puas tsuaj yog (astm txheem g 36), feem ntau nrog kev ntxhov siab U-khoov kuaj. Raws li muaj tseeb los ntawm cov txiaj ntsig hauv qab no, ob tsib alloys, c {}}}}}}}}}}}}}}}}}}}}}} Cov qauv ntawm kev tawm tsam ntau dua li cov hlau sib piv. Cov kev ntsuam xyuas tau nres tom qab 1,008 teev (rau lub lis piam).
| Hlau | Lub sij hawm mus tawg |
| 316L | 2 h |
| 254Smo | 24 h |
| 625 | Tsis muaj kev tawg hauv 1,008 h |
| C-276 | Tsis muaj kev tawg hauv 1,008 h |
4. suav rau dej hiav txwv crevice corrosion
Dej hiav txwv yog tej zaum cov ntsev tsis zoo tshaj plaws. Tsis yog tsuas yog nws ntsib hauv cov tsheb thauj mus los thiab cov roj Rigs, tab sis nws tseem siv los ua cov chaw txias hauv ntug hiav txwv. Cov ntaub ntawv tau tsim los ua ib feem ntawm Asmeskas Navy Kev Kawm hauv Wrighlectville Puam, thiab luam tawm los ntawm DM Aylor li 329, Nace Thoob Ntiaj Teb, 1999). Cov kev ntsuam xyuas crevice tau ua nyob rau hauv ob qho tseem (quiescent) thiab ntws dej hiav txwv, ntawm 29 degree, ntxiv lossis rho tawm 3 degree. Ob qho qauv (A & B) ntawm txhua txoj kev sib tw tau sim nyob rau hauv tseem cov dej rau xyoo 180 hnub, thiab zoo li cov dej ntws. Txhua qhov qauv muaj ob qhov chaw ua haujlwm cev.
| Hlau | Quiescent | Ntws | ||
| Tsis tau. Ntawm cov chaw rog | Qhov siab tshaj plaws ntawm kev tawm tsam, hli | Tsis tau. Ntawm cov chaw rog | Qhov siab tshaj plaws ntawm kev tawm tsam, hli | |
| 316L | A:2, B:2 | A:1.33, B:2.27 | A:2, B:2 | A:0.48, B:0.15 |
| 254Smo | A:2, B:2 | A:0.76, B:1.73 | A:2, B:2 | A:0.01, B:<0.01 |
| 625 | A:1, B:2 | A:0.18, B:0.04 | A:2, B:2 | A:<0.01, B:<0.01 |
| C-276 | A:1, B:1 | A:0.10, B:0.13 | A:0, B:0 | A:0, B:0 |
5.corrosion resistance ntawm welds
Txhawm rau ntsuas qhov tsis kam ntawm Welds ua kom xeb, Hinnes International sib tw, tsim los ntawm plaub-hlau sib dhos ntawm cov tsheb nqaj hlau hlau (MIG) Weld kis. Qhov tseeb, lub inomogeneous xwm ntawm weld micrtructures ua rau cov nqi corrosion ntau dua (tshaj nrog homogeneous, wrought cov khoom). Txawm li cas los xij, hastelloy®C -276 Cov ntaub ntawv pov thawj ua tau zoo rau tus yuam sij, txawm nyob hauv Welded daim ntawv, raws li qhia hauv qab no:
| Tshuaj | Kev xav ntsoov | Qho so | Corrosion tus nqi | ||||
| wt.% | Degree F | tiv kis | Weld Hlau | Wringught Hlau Hlau | |||
| tus mpy | mm \/ y | tus mpy | mm \/ y | ||||
|
H2Yog li4
|
30 | 150 | 66 | 1.2 | 0.03 | 0.1 | 0.01 |
|
H2Yog li4
|
50 | 150 | 66 | 1.2 | 0.03 | 0.8 | 0.02 |
|
H2Yog li4
|
70 | 150 | 66 | 5.1 | 0.13 | 2.0 | 0.05 |
|
H2Yog li4
|
90 | 150 | 66 | 4.3 | 0.11 | 1.2 | 0.03 |
| Thr | 10 | 100 | 38 | 8.7 | 0.22 | 6.7 | 0.17 |
| Thr | 15 | 100 | 38 | 7.9 | 0.20 | 7.5 | 0.19 |
| Thr | 20 | 100 | 38 | 6.3 | 0.16 | 5.5 | 0.14 |
